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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2019-02-02 10:41:18 +0100
committerIngo Molnar <mingo@kernel.org>2019-02-04 08:27:30 +0100
commit69c1f396f25b805aeff08f06d2e992c315ee5b1e (patch)
tree7463653c8bd95300d4ae5697f00a4e061f8c613d /arch/x86/platform
parentce9084ba0d1d8030adee7038ace32f8d9d423d0f (diff)
efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation
Move the x86 EFI earlyprintk implementation to a shared location under drivers/firmware and tweak it slightly so we can expose it as an earlycon implementation (which is generic) rather than earlyprintk (which is only implemented for a few architectures) This also involves switching to write-combine mappings by default (which is required on ARM since device mappings lack memory semantics, and so memcpy/memset may not be used on them), and adding support for shared memory framebuffers on cache coherent non-x86 systems (which do not tolerate mismatched attributes). Note that 32-bit ARM does not populate its struct screen_info early enough for earlycon=efifb to work, so it is disabled there. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Alexander Graf <agraf@suse.de> Cc: AKASHI Takahiro <takahiro.akashi@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Heinrich Schuchardt <xypron.glpk@gmx.de> Cc: Jeffrey Hugo <jhugo@codeaurora.org> Cc: Lee Jones <lee.jones@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Jones <pjones@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20190202094119.13230-10-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/platform')
-rw-r--r--arch/x86/platform/efi/Makefile1
-rw-r--r--arch/x86/platform/efi/early_printk.c240
2 files changed, 0 insertions, 241 deletions
diff --git a/arch/x86/platform/efi/Makefile b/arch/x86/platform/efi/Makefile
index e4dc3862d423..fe29f3f5d384 100644
--- a/arch/x86/platform/efi/Makefile
+++ b/arch/x86/platform/efi/Makefile
@@ -3,5 +3,4 @@ OBJECT_FILES_NON_STANDARD_efi_thunk_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_efi_stub_$(BITS).o := y
obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
-obj-$(CONFIG_EARLY_PRINTK_EFI) += early_printk.o
obj-$(CONFIG_EFI_MIXED) += efi_thunk_$(BITS).o
diff --git a/arch/x86/platform/efi/early_printk.c b/arch/x86/platform/efi/early_printk.c
deleted file mode 100644
index 7138bc7a265c..000000000000
--- a/arch/x86/platform/efi/early_printk.c
+++ /dev/null
@@ -1,240 +0,0 @@
-/*
- * Copyright (C) 2013 Intel Corporation; author Matt Fleming
- *
- * This file is part of the Linux kernel, and is made available under
- * the terms of the GNU General Public License version 2.
- */
-
-#include <linux/console.h>
-#include <linux/efi.h>
-#include <linux/font.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <asm/setup.h>
-
-static const struct font_desc *font;
-static u32 efi_x, efi_y;
-static void *efi_fb;
-static bool early_efi_keep;
-
-/*
- * efi earlyprintk need use early_ioremap to map the framebuffer.
- * But early_ioremap is not usable for earlyprintk=efi,keep, ioremap should
- * be used instead. ioremap will be available after paging_init() which is
- * earlier than initcall callbacks. Thus adding this early initcall function
- * early_efi_map_fb to map the whole efi framebuffer.
- */
-static __init int early_efi_map_fb(void)
-{
- u64 base, size;
-
- if (!early_efi_keep)
- return 0;
-
- base = boot_params.screen_info.lfb_base;
- if (boot_params.screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
- base |= (u64)boot_params.screen_info.ext_lfb_base << 32;
- size = boot_params.screen_info.lfb_size;
- efi_fb = ioremap(base, size);
-
- return efi_fb ? 0 : -ENOMEM;
-}
-early_initcall(early_efi_map_fb);
-
-/*
- * early_efi_map maps efi framebuffer region [start, start + len -1]
- * In case earlyprintk=efi,keep we have the whole framebuffer mapped already
- * so just return the offset efi_fb + start.
- */
-static __ref void *early_efi_map(unsigned long start, unsigned long len)
-{
- u64 base;
-
- base = boot_params.screen_info.lfb_base;
- if (boot_params.screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
- base |= (u64)boot_params.screen_info.ext_lfb_base << 32;
-
- if (efi_fb)
- return (efi_fb + start);
- else
- return early_ioremap(base + start, len);
-}
-
-static __ref void early_efi_unmap(void *addr, unsigned long len)
-{
- if (!efi_fb)
- early_iounmap(addr, len);
-}
-
-static void early_efi_clear_scanline(unsigned int y)
-{
- unsigned long *dst;
- u16 len;
-
- len = boot_params.screen_info.lfb_linelength;
- dst = early_efi_map(y*len, len);
- if (!dst)
- return;
-
- memset(dst, 0, len);
- early_efi_unmap(dst, len);
-}
-
-static void early_efi_scroll_up(void)
-{
- unsigned long *dst, *src;
- u16 len;
- u32 i, height;
-
- len = boot_params.screen_info.lfb_linelength;
- height = boot_params.screen_info.lfb_height;
-
- for (i = 0; i < height - font->height; i++) {
- dst = early_efi_map(i*len, len);
- if (!dst)
- return;
-
- src = early_efi_map((i + font->height) * len, len);
- if (!src) {
- early_efi_unmap(dst, len);
- return;
- }
-
- memmove(dst, src, len);
-
- early_efi_unmap(src, len);
- early_efi_unmap(dst, len);
- }
-}
-
-static void early_efi_write_char(u32 *dst, unsigned char c, unsigned int h)
-{
- const u32 color_black = 0x00000000;
- const u32 color_white = 0x00ffffff;
- const u8 *src;
- u8 s8;
- int m;
-
- src = font->data + c * font->height;
- s8 = *(src + h);
-
- for (m = 0; m < 8; m++) {
- if ((s8 >> (7 - m)) & 1)
- *dst = color_white;
- else
- *dst = color_black;
- dst++;
- }
-}
-
-static void
-early_efi_write(struct console *con, const char *str, unsigned int num)
-{
- struct screen_info *si;
- unsigned int len;
- const char *s;
- void *dst;
-
- si = &boot_params.screen_info;
- len = si->lfb_linelength;
-
- while (num) {
- unsigned int linemax;
- unsigned int h, count = 0;
-
- for (s = str; *s && *s != '\n'; s++) {
- if (count == num)
- break;
- count++;
- }
-
- linemax = (si->lfb_width - efi_x) / font->width;
- if (count > linemax)
- count = linemax;
-
- for (h = 0; h < font->height; h++) {
- unsigned int n, x;
-
- dst = early_efi_map((efi_y + h) * len, len);
- if (!dst)
- return;
-
- s = str;
- n = count;
- x = efi_x;
-
- while (n-- > 0) {
- early_efi_write_char(dst + x*4, *s, h);
- x += font->width;
- s++;
- }
-
- early_efi_unmap(dst, len);
- }
-
- num -= count;
- efi_x += count * font->width;
- str += count;
-
- if (num > 0 && *s == '\n') {
- efi_x = 0;
- efi_y += font->height;
- str++;
- num--;
- }
-
- if (efi_x + font->width > si->lfb_width) {
- efi_x = 0;
- efi_y += font->height;
- }
-
- if (efi_y + font->height > si->lfb_height) {
- u32 i;
-
- efi_y -= font->height;
- early_efi_scroll_up();
-
- for (i = 0; i < font->height; i++)
- early_efi_clear_scanline(efi_y + i);
- }
- }
-}
-
-static __init int early_efi_setup(struct console *con, char *options)
-{
- struct screen_info *si;
- u16 xres, yres;
- u32 i;
-
- si = &boot_params.screen_info;
- xres = si->lfb_width;
- yres = si->lfb_height;
-
- /*
- * early_efi_write_char() implicitly assumes a framebuffer with
- * 32-bits per pixel.
- */
- if (si->lfb_depth != 32)
- return -ENODEV;
-
- font = get_default_font(xres, yres, -1, -1);
- if (!font)
- return -ENODEV;
-
- efi_y = rounddown(yres, font->height) - font->height;
- for (i = 0; i < (yres - efi_y) / font->height; i++)
- early_efi_scroll_up();
-
- /* early_console_register will unset CON_BOOT in case ,keep */
- if (!(con->flags & CON_BOOT))
- early_efi_keep = true;
- return 0;
-}
-
-struct console early_efi_console = {
- .name = "earlyefi",
- .write = early_efi_write,
- .setup = early_efi_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
-};